Nitric oxide measurements in the Arctic winter stratosphere

Details Nitric oxide measurements in the Arctic winter stratosphere Nitric oxide measurements in the Arctic winter stratosphere

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17..489f&link_type=abstract

Geophysical Research Letters, Supplement (ISSN 0094-8276), vol. 17, March 1990, p. 489-492.

Computer Science

Sound

23

Abundance, Arctic Regions, Atmospheric Chemistry, Atmospheric Composition, Nitric Oxide, Stratosphere, Atmospheric Sounding, Chemiluminescence, Reaction Kinetics, Vertical Distribution, Winter

Scientific paper

Measurements of NO from five flights of the NASA ER-2 aircraft during the Airborne Arctic Stratospheric Expedition are presented. The NO values and vertical gradient near 60 deg N latitude are similar to previous measurements near 50 deg N in winter (Ridley et al., 1984, 1987). The NO latitudinal gradient is distinctly negative outside of the polar vortex, approaching zero at the boundary of the vortex, and remaining below the 20 pptv detection limit inside the vortex. Steady state NO2 and NO(x) (NO + NO2) are calculated from measured NO, O3, and ClO, and modeled photodissociation rates. NO(x) outside the vortex shows a negative dependence on latitude and solar zenith angle. Low NO(x) and NO(x)/NO(y), inside and near the vortex boundary may be indications of heterogeneous removal of ClONO2 and N2O5.

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